Excerpt from Mineral Resources of the United States, 1925, Vol. 2: NonmetalsIt will be noted that the average value per ton is much higher for the plants in the Central States than for those in Pennsylvania, a difference that is explained in part by location Of the plants with respect to their supply Of raw fuel and in part by the prices Of competitive fuels.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.